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Nearby topography (hills and valleys) attracts the mass in the gravimeter (valleys are considered to have negative density with respect to the surrounding rocks) and reduces the observed value of gravity. The terrain correction is the calculated effect of this topography and is always positive (a hill pulls up on the mass in the gravimeter and a valley is a mass deficiency).
Wiki User
∙ 10y ago
Wiki User
∙ 10y agoA hill always pulls up on the mass
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